Decades ago, a valuable treasure was stolen and Lupin is on the hunt to find it. Harimao, a notorious thief during World War II, collected the items and they are now worth billions of dollars. Lupin's plan was to trick Sir Archer, a retired British spy, into revealing the treasure's whereabouts, but to Lupin's surprise, Archer decides to help on the search. Together, they must outsmart a cunning adversary who also has his eyes set on the treasure. Meanwhile, Zenigata is relentlessly pursuing Lupin and his gang in hopes of catching them once again.